68317921 has 8 divisors (see below), whose sum is σ = 78231104. Its totient is φ = 58443120.

The previous prime is 68317919. The next prime is 68317937. The reversal of 68317921 is 12971386.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 68317921 - 2¹ = 68317919 is a prime.

It is not an unprimeable number, because it can be changed into a prime (68317121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5670 + ... + 12991.

It is an arithmetic number, because the mean of its divisors is an integer number (9778888).

Almost surely, 2^68317921 is an apocalyptic number.

It is an amenable number.

68317921 is a deficient number, since it is larger than the sum of its proper divisors (9913183).

68317921 is a wasteful number, since it uses less digits than its factorization.

68317921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19191.

The product of its digits is 18144, while the sum is 37.

The square root of 68317921 is about 8265.4655646249. The cubic root of 68317921 is about 408.8006213745.

The spelling of 68317921 in words is "sixty-eight million, three hundred seventeen thousand, nine hundred twenty-one".